Hereditary Neuropathy with Liability to Pressure Palsies (PMP22)
GTR Test Accession: Help GTR000319468.5
INHERITED DISEASENERVOUS SYSTEMSYNDROMIC DISEASE ... View more
Last updated in GTR: 2024-02-07
Last annual review date for the lab: 2024-02-07 LinkOut
At a Glance
Diagnosis; Mutation Confirmation
Hereditary liability to pressure palsies; Charcot-Marie-Tooth disease, type IA; Charcot-Marie-Tooth disease-hearing loss-intellectual disability syndrome
Genes (1): Help
PMP22 (17p12)
Molecular Genetics - Deletion/duplication analysis: Multiplex Ligation-dependent Probe Amplification (MLPA); Next-Generation (NGS)/Massively parallel sequencing (MPS); ...
The diagnosis of HNPP is established in an adult with …
It is estimated that ~80% of individuals with a clinical …
Establish or confirm diagnosis
Ordering Information
Offered by: Help
Molecular Genetics Laboratory
View lab's website
View lab's test page
Test short name: Help
HNPP
Specimen Source: Help
Who can order: Help
  • Genetic Counselor
  • Licensed Physician
Test Order Code: Help
Hereditary Neuropathy with Liability to Pressure Palsies (PMP22)
Lab contact: Help
Gavin Giles, MSc, Administrator
gavin.giles@lhsc.on.ca
+1-519-685-8500 x36339
Contact Policy: Help
Laboratory can only accept contact from health care providers. Patients/families are encouraged to discuss genetic testing options with their health care provider.
How to Order: Help
please complete the requisition provided on the website and ensure that it is signed by the referring physician
Order URL
Test service: Help
Clinical Testing/Confirmation of Mutations Identified Previously
Confirmation of research findings
Custom Deletion/Duplication Testing
Custom Sequence Analysis
Test additional service: Help
Custom mutation-specific/Carrier testing
Test development: Help
Test developed by laboratory (no manufacturer test name)
Informed consent required: Help
Decline to answer
Test strategy: Help
Patient screened for Deletion of PMP22 gene and full coding sequence. All coding exons and 20 bp of flanking intronic sequence are enriched using an LHSC custom targeted hybridization protocol (Roche Nimblegen), followed by high throughput sequencing (Illumina). This chemistry and analysis pipeline provides a highly sensitive and specific detection … View more
View citations (1)
  • Schenkel LC, Kerkhof J, Stuart A, Reilly J, Eng B, Woodside C, Levstik A, Howlett CJ, Rupar AC, Knoll JHM, Ainsworth P, Waye JS, Sadikovic B. Clinical Next-Generation Sequencing Pipeline Outperforms a Combined Approach Using Sanger Sequencing and Multiplex Ligation-Dependent Probe Amplification in Targeted Gene Panel Analysis. J Mol Diagn. 2016;18(5):657-667. doi:10.1016/j.jmoldx.2016.04.002. Epub 2016 Jul 02. PMID: 27376475.
Pre-test genetic counseling required: Help
Decline to answer
Post-test genetic counseling required: Help
Decline to answer
Conditions Help
Total conditions: 3
Condition/Phenotype Identifier
Test Targets
Genes Help
Total genes: 1
Gene Associated Condition Germline or Somatic Allele (Lab-provided) Variant in NCBI
Methodology
Total methods: 3
Method Category Help
Test method Help
Instrument
Deletion/duplication analysis
Multiplex Ligation-dependent Probe Amplification (MLPA)
Applied Biosystems 3730 capillary sequencing instrument
Deletion/duplication analysis
Next-Generation (NGS)/Massively parallel sequencing (MPS)
Illumina MiSeq/NextSeq
Sequence analysis of the entire coding region
Next-Generation (NGS)/Massively parallel sequencing (MPS)
Applied Biosystems 3730 capillary sequencing instrument
Illumina MiSeq/NextSeq
Clinical Information
Test purpose: Help
Diagnosis; Mutation Confirmation
Clinical validity: Help
It is estimated that ~80% of individuals with a clinical diagnosis of HNPP will carry the deletion encompasing PMP22. The remaining 20% are predicted to carry a deleterious point mutation in the PMP22 gene
View citations (3)
  • Chrestian N. Hereditary Neuropathy with Liability to Pressure Palsies. 1998 Sep 28 [updated 2020 Aug 27]. In: Adam MP, Feldman J, Mirzaa GM, Pagon RA, Wallace SE, Bean LJH, Gripp KW, Amemiya A, editors. GeneReviews® [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2024. PMID: 20301566.
  • Chrestian N. Hereditary Neuropathy with Liability to Pressure Palsies. 1998 Sep 28 [updated 2020 Aug 27]. In: Adam MP, Feldman J, Mirzaa GM, Pagon RA, Wallace SE, Bean LJH, Gripp KW, Amemiya A, editors. GeneReviews® [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2024. PMID: 20301566.
  • https://www.ncbi.nlm.nih.gov/books/NBK1392
Clinical utility: Help
Target population: Help
The diagnosis of HNPP is established in an adult with recurrent focal compression neuropathies who has a family history consistent with autosomal dominant inheritance. PMP22 is the only gene known to be associated with HNPP. A contiguous gene deletion of chromosome 17p11.2 that includes PMP22 is present in approximately 80% … View more
View citations (2)
  • Chrestian N. Hereditary Neuropathy with Liability to Pressure Palsies. 1998 Sep 28 [updated 2020 Aug 27]. In: Adam MP, Feldman J, Mirzaa GM, Pagon RA, Wallace SE, Bean LJH, Gripp KW, Amemiya A, editors. GeneReviews® [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2024. PMID: 20301566.
  • Chrestian N. Hereditary Neuropathy with Liability to Pressure Palsies. 1998 Sep 28 [updated 2020 Aug 27]. In: Adam MP, Feldman J, Mirzaa GM, Pagon RA, Wallace SE, Bean LJH, Gripp KW, Amemiya A, editors. GeneReviews® [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2024. PMID: 20301566.
Variant Interpretation:
What is the protocol for interpreting a variation as a VUS? Help
Novel variations are interrogated using a series of tools. Literature reviews and a search of relevant databases and dbSNP is pursued. This is followed by evaluation using web based insilco analysis including, but not restricted to SIFT, Polyphen2, AlignGVGD, SNPs&GO and ASSEDA(splice). If the pathogenicity is still indeterminate (ACMG group … View more

Will the lab re-contact the ordering physician if variant interpretation changes? Help
Not provided.
Recommended fields not provided:
Technical Information
Test Procedure: Help
All coding exons and 20 bp of flanking intronic sequence are enriched using an LHSC custom targeted hybridization protocol (Roche Nimblegen), followed by high throughput sequencing (Illumina). This chemistry and analysis pipeline provides a highly sensitive and specific detection of sequence and copy number alterations in a single assay that … View more
View citations (1)
  • Schenkel LC, Kerkhof J, Stuart A, Reilly J, Eng B, Woodside C, Levstik A, Howlett CJ, Rupar AC, Knoll JHM, Ainsworth P, Waye JS, Sadikovic B. Clinical Next-Generation Sequencing Pipeline Outperforms a Combined Approach Using Sanger Sequencing and Multiplex Ligation-Dependent Probe Amplification in Targeted Gene Panel Analysis. J Mol Diagn. 2016;18(5):657-667. doi:10.1016/j.jmoldx.2016.04.002. Epub 2016 Jul 02. PMID: 27376475.
Test Confirmation: Help
Mutations identified are repeated in an independent assay
Availability: Help
Tests performed
Entire test performed in-house
Analytical Validity: Help
Methodology predicted to detect >99% of mutations identified in the regions screened
View citations (1)
  • Schenkel LC, Kerkhof J, Stuart A, Reilly J, Eng B, Woodside C, Levstik A, Howlett CJ, Rupar AC, Knoll JHM, Ainsworth P, Waye JS, Sadikovic B. Clinical Next-Generation Sequencing Pipeline Outperforms a Combined Approach Using Sanger Sequencing and Multiplex Ligation-Dependent Probe Amplification in Targeted Gene Panel Analysis. J Mol Diagn. 2016;18(5):657-667. doi:10.1016/j.jmoldx.2016.04.002. Epub 2016 Jul 02. PMID: 27376475.
Proficiency testing (PT):
Is proficiency testing performed for this test? Help
No
VUS:
Software used to interpret novel variations Help
May include, but not restricted to SNP&Go, SIFT, Polyphen2, dbSNP, ASSEDA

Laboratory's policy on reporting novel variations Help
All variants interpreted as either ACMG category 1, 2, or 3 (pathogenic, likely pathogenic, VUS; PMID: 25741868) are confirmed using Sanger sequencing, MLPA, or other assays. ACMG category 4 and 5 variants (likely benign, benign) are not reported, but are available upon request.
Recommended fields not provided:
Regulatory Approval
FDA Review: Help
Category: FDA exercises enforcement discretion
Additional Information

IMPORTANT NOTE: NIH does not independently verify information submitted to GTR; it relies on submitters to provide information that is accurate and not misleading. NIH makes no endorsements of tests or laboratories listed in GTR. GTR is not a substitute for medical advice. Patients and consumers with specific questions about a genetic test should contact a health care provider or a genetics professional.